Magic Constant of Order 3 Magic Square/Proof 2
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Theorem
The magic constant of the order $3$ magic square is $15$.
Proof
Let $M_n$ denote the magic square of order $n$.
By Magic Constant of Magic Square, the magic constant of $M_n$ is given by:
- $S_n = \dfrac {n \left({n^2 + 1}\right)} 2$
Setting $n = 3$:
- $S_3 = \dfrac {3 \times 10} 2 = 15$
$\blacksquare$